These vehicles, part of the Hot Wheels Racing line, were based on actual NASCAR Winston Cup Series cars from the 1997 and 1998 seasons. They were widely available for several years but only in the USA. English is the only language on the packaging and they were released in two sizes of boxes as well as blister cards.

NASCAR X-V Racers were sold individually as well as with two track sets, the smaller Daytona 500 and the larger NASCAR Superspeedway track.The Superspeedway set was identical to the F1 Grand Prix set except for cars, decals, instructions and box graphics. The NASCAR track sets were widely released, with many sets (new and used) still available on the secondary market more than 15 years after production stopped. NASCAR X-V Racers track sets always came with
a #44 Hot Wheels car and one other car (varied), explaining why almost half the loose NASCAR cars on the market are #44.

There
are 12 different cars/drivers represented in the NASCAR series, with known tampo
variations on the #5 Kellogg's, #6 Valvoline, #44 Hot Wheels and #94 MacDonald's cars.

The
vehicle chassis is the same one as most Regular X-V Racers, and is interchangeable with them once you manage to get the screws out. Likewise, there is no difference in style between NASCAR and regular X-V chargers. As with the F1 racers, all chargers sold with the individual NASCAR vehicles were black.

The NASCAR bodies came in four different styles. Descriptions can be found here. I have arbitrarily named them Type A, B, C and D, and they correspond to the different manufacturers. Type A is the Chevrolet Monte Carlo, Type B is the Ford Thunderbird, Type C the Ford Taurus and Type D the Pontiac Grand Prix. The different body styles are interchangeable on the universal NASCAR chassis. Interestingly, Mattel actually changed the X-V Racer body casting of the Fords to reflect the change from Thunderbird to Taurus between the 1997 and 1998 Winston Cup Series seasons. It probably would have been easier just to change the tampo name.